CA2095063A1 - Method for Separating Impurities from an Aqueous Alkali Metal Chlorate Electrolyte - Google Patents

Method for Separating Impurities from an Aqueous Alkali Metal Chlorate Electrolyte

Info

Publication number
CA2095063A1
CA2095063A1 CA2095063A CA2095063A CA2095063A1 CA 2095063 A1 CA2095063 A1 CA 2095063A1 CA 2095063 A CA2095063 A CA 2095063A CA 2095063 A CA2095063 A CA 2095063A CA 2095063 A1 CA2095063 A1 CA 2095063A1
Authority
CA
Canada
Prior art keywords
electrolyte
calcium
sulphate
alkali metal
ions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2095063A
Other languages
French (fr)
Other versions
CA2095063C (en
Inventor
Stina Eriksson
Ulla-Kari Holmstrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nouryon Pulp and Performance Chemicals AB
Original Assignee
Eka Nobel AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eka Nobel AB filed Critical Eka Nobel AB
Publication of CA2095063A1 publication Critical patent/CA2095063A1/en
Application granted granted Critical
Publication of CA2095063C publication Critical patent/CA2095063C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
    • C01B11/12—Chloric acid
    • C01B11/14—Chlorates
    • C01B11/145—Separation; Crystallisation; Purification, After-treatment; Stabilisation by additives

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

The invention relates to a method for separating sulphate from an aqueous electrolyte in an alkali metal chlorate process, thereby reducing the operating cost and increasing the possibility of further closing the electrolytical production of alkali metal chlorate. Calcium ions are added to a portion of the electrolyte, for precipitating calcium sulphate. By adjusting the pH within the range of from 4.6 up to about 7, and combining the temperature, content of ions and the molar ratio between sulphate and calcium ions added in a suitable manner, the calcium sulphate will precipitate predominantly as gypsum and essentially without inclusions and/or co-precipitation of chromium-containing compounds or chlorate. The precipitate is subsequently removed from the portion of electrolyte, whereafter the thus purified portion of electrolyte is recycled to the chlorate process. Any fluoride ions in the electrolyte can also be removed by the addition of calcium ions and a subsequent co-separation of the calcium fluoride precipitated with the calcium sulphate.
CA002095063A 1993-03-09 1993-04-28 Method for separating impurities from an aqueous alkali metal chlorate electrolyte Expired - Lifetime CA2095063C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9300779A SE511987C2 (en) 1993-03-09 1993-03-09 Method of separating sulfate from an aqueous electrolyte in an alkali metal chlorate process
SE9300779-7 1993-03-09

Publications (2)

Publication Number Publication Date
CA2095063A1 true CA2095063A1 (en) 1994-09-10
CA2095063C CA2095063C (en) 1999-01-12

Family

ID=20389163

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002095063A Expired - Lifetime CA2095063C (en) 1993-03-09 1993-04-28 Method for separating impurities from an aqueous alkali metal chlorate electrolyte

Country Status (3)

Country Link
US (1) US5350495A (en)
CA (1) CA2095063C (en)
SE (1) SE511987C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5681446A (en) * 1995-08-30 1997-10-28 Sterling Pulp Chemicals, Ltd. Impurity removal for sodium chlorate
GB9815173D0 (en) * 1998-07-13 1998-09-09 Nat Power Plc Process for the removal of sulphate ions
US6478971B1 (en) * 2000-09-21 2002-11-12 Cargill, Incorporated Process for removing sulfate from an aqueous salt solution
CN103608289A (en) * 2011-04-20 2014-02-26 索尔维公司 Process of purifying a residue with calcium ions

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2450259B2 (en) * 1974-10-23 1979-03-29 Bayer Ag, 5090 Leverkusen Process for cleaning electrolysis brine
US4259297A (en) * 1979-09-04 1981-03-31 Olin Corporation Chromate removal from concentrated chlorate solution by chemical precipitation
US4636376A (en) * 1985-09-30 1987-01-13 Ppg Industries, Inc. Sulfate removal from alkali metal chlorate solutions
US4702805A (en) * 1986-03-27 1987-10-27 C-I-L Inc. Production of sodium chlorate
US4699701A (en) * 1986-10-29 1987-10-13 Tenneco Canada Inc. (Erco Division) Electrochemical removal of chromium from chlorate solutions
US4976936A (en) * 1989-08-18 1990-12-11 Dravo Lime Company Flue gas desulfurization with oxidation of calcium sulfite in FGD discharges
US5215632A (en) * 1990-04-30 1993-06-01 Occidental Chemical Corporation Fluoride removal from aqueous streams
US5108722A (en) * 1990-08-27 1992-04-28 Occidental Chemical Corporation Sulfate removal from chlorate liquor
FR2673423B1 (en) * 1991-03-01 1994-04-15 Krebs Cie PROCESS FOR THE ELIMINATION OF SULFATES CONTAINED IN SOLUTIONS OF ALKALINE CHLORATES AND PRODUCTION OF SAID ALKALINE CHLORATES.

Also Published As

Publication number Publication date
SE9300779D0 (en) 1993-03-09
SE511987C2 (en) 2000-01-10
US5350495A (en) 1994-09-27
SE9300779L (en) 1994-09-10
CA2095063C (en) 1999-01-12

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Legal Events

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